ON FUNGOID DISEASES OP THE VINE. 
G9 
the Royal Horticultural Society, without recording the feeling of 
gratitude with which we all revert to the labours of the Rev. M. 
J. Berkeley in this and kindred subjects, but especially for his 
untiring perseverance in the investigaton of the diseases of the 
Vine, Hop, and Potato. In the earlier volumes of the Journal of 
this Society, those memoirs of his will continue to testify to his great 
services to horticulture, as they have forined the basis of all 
subsequent researches. 
Uncinula spiralis , Rerk. & Curt.—This is the American 
representative of the European Yine-mildew, and was first noted 
by Berkeley as a distinct species in his “Introduction to Crypto- 
gamic Botany.” It appears first as an Oidium , scarcely, if at all, 
differing from Oidium Tucheri , and afterwards freely produces con- 
ceptacles, which the European Oidium does not. Recently Hr. 
Earlow has given some interesting details of this species in the 
“Bulletin” of the Bussey Institution, which may be reproduced 
with advantage. “ Huring the past year,” he says, “ this Uncinula 
was more common in Eastern Massachusetts than the year before, 
but not, however, so common as Peronospora viticola. The two 
Eungi were not unfrequently found growing together on the same 
leaf. In the "West, however, the Uncinula seems to have caused 
more trouble than in the East, and in California it prevailed to 
such an extent as to have seriously injured the Yines. The 
Eungus was so common that it was frequently exhibited at agri¬ 
cultural societies, where it seems to have generally been called 
Oidium Tucheri ) on the supposition that it was the Eungus to which 
that name is applied in Europe. 
“In midsummer and autumn the leaves and young stalks, of 
both our cultivated and wild Grapes are covered with the white 
spots of Uncinula spiralis , which look not unlike dust. The spots 
are plainer on the upper than on the lower surface of the leaves 
while the spots made by Peronospora viticola are principally on 
the lower surface of the leaf, and look more like frost than dust. 
The spots grow larger and larger until they cover the whole leaf, the 
young stalks, and the berries themselves. A microscopic examina¬ 
tion made early in the season shows that the spots are composed of 
white mycelial threads, which branch in various directions, and 
are furnished at intervals with suckers, by means of which the 
Eungus is attached to the epidermis of the leaf. The diameter of 
the filaments is about *004 millimetres, and the transverse cell- 
walls are numerous. The conidia are produced in the following 
